2 PRODUCTS OF RING-OPENING REACTIONS OF AN ARYLTHIONITROOXIRANE

Crystal structure determination of the products, S-(4-methylphenyl) (a lpha ha-bromo-2,2-dimethyl-1,3-dioxolane-4-thioacetate, C14H17BrO3S, ( 2), and S-(4-methylphenyl) (alpha nylamino)-2,2-dimethyl-1,3-dioxolane -4-thioacetate C22H25NO5S, (3), Of the two reactions, including absolu te-structure assignment, shows that they proceed stereospecifically wi th inversion of configuration. Common groups of the two structures hav e essentially the same bond lengths and angles, but different conforma tions, arising from weak hydrogen bonding and van der Waals interactio ns.